How Can I Effectively Use Both Go Modules and Local Packages in My Project?

Understanding Go Modules and Local Packages

In Go 1.11 and later, the introduction of modules has added another layer to project organization. This question delves into the challenges of utilizing both modules and local packages effectively.

The provided code sample attempts to establish a local package within an application folder but encounters build errors when using 'go mod init'. The issue lies in the use of the incorrect import path for the local package.

To correctly import a local package, two key tricks are required:

1. Compile and Cache the Local Package:

   Run "go build" within the local package directory to compile and place it in the build cache. This step ensures the package is accessible to the main package.

2. Use a Relative Import Path:

   When importing the local package, specify the path relative to the project. Determine the correct path using 'go doc' or 'go list'. For instance, if the local package is at 'tools/src/hello/docs', the import statement should be 'tools/src/hello/docs'.

Additional notes on modules:

• 'go.mod' files can be used to define module dependencies and their version requirements.
• 'go' offers various resources for understanding modules, such as the official Go wiki page.

By following these guidelines, developers can effectively organize their Go projects using modules and local packages.

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